:root {
  --ink: #1f2937;
  --muted: #667085;
  --line: #d9dee7;
  --surface: #ffffff;
  --canvas: #f4f5f7;
  --blue: #334155;
  --blue-dark: #1f2937;
  --blue-soft: #eef1f5;
  --mint: #0f8b72;
  --mint-soft: #e8f7f2;
  --amber: #a66800;
  --amber-soft: #fff4dc;
  --red: #b23543;
  --red-soft: #fff0f1;
  --shadow: 0 6px 18px rgba(15, 23, 42, .08);
  font-family: Pretendard, "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--canvas);
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: var(--canvas); }
button, input { font: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }
.skip-link { position: fixed; top: 12px; left: 16px; z-index: 100; padding: 10px 14px; color: white; background: var(--ink); border-radius: 8px; transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid #7fa1ff; outline-offset: 2px; }

.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--line); background: white; }
.header-inner { display: flex; align-items: center; justify-content: space-between; max-width: 1120px; min-height: 72px; margin: auto; padding: 0 24px; }
.brand-button { display: flex; align-items: center; padding: 0; border: 0; color: var(--ink); background: none; text-align: left; }
.brand-button strong { display: block; }
.brand-button strong { font-size: 15px; }
.student-menu { display: flex; align-items: center; gap: 14px; color: var(--muted); font-size: 14px; }
.student-menu > span { color: var(--ink); font-weight: 700; }
.text-button { padding: 7px 9px; border: 0; border-radius: 8px; color: var(--muted); background: transparent; }
.text-button:hover { background: var(--canvas); color: var(--ink); }

.login-shell { display: grid; grid-template-columns: minmax(0, 440px); gap: 16px; align-content: center; justify-content: center; min-height: 100vh; padding: 32px 20px; background: var(--canvas); }
.login-card { padding: 32px; border: 1px solid var(--line); border-radius: 12px; background: white; }
.eyebrow { color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .16em; }
.login-card h1 { margin: 0 0 10px; font-size: 28px; line-height: 1.25; letter-spacing: -.03em; }
.login-copy { margin: 0 0 24px; color: var(--muted); line-height: 1.6; }
.login-form { display: grid; gap: 16px; }
.login-form label { display: grid; gap: 8px; font-size: 13px; font-weight: 700; }
.login-form input, .integer-input { min-height: 48px; border: 1px solid var(--line); border-radius: 11px; color: var(--ink); background: white; }
.login-form input { padding: 0 14px; }
.login-form input:focus, .integer-input:focus { border-color: var(--blue); box-shadow: 0 0 0 4px var(--blue-soft); outline: none; }
.primary-button { min-height: 48px; padding: 0 20px; border: 0; border-radius: 9px; color: white; background: var(--blue); font-weight: 800; }
.primary-button:hover { background: var(--blue-dark); }
.primary-button:disabled { cursor: wait; opacity: .65; }
.form-message { min-height: 20px; margin: 12px 0 0; color: var(--red); font-size: 13px; }
.pipeline-note { padding: 18px 20px; border: 1px solid var(--line); border-radius: 12px; background: white; color: var(--muted); font-size: 13px; }
.pipeline-note strong { display: block; margin-bottom: 12px; color: var(--ink); font-size: 13px; }
.pipeline-note ol { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 0; padding: 0; list-style-position: inside; }
.pipeline-note li { white-space: nowrap; }

.app-shell { max-width: 1120px; margin: auto; padding: 42px 24px 80px; }
.page-heading { display: flex; gap: 24px; align-items: end; justify-content: space-between; margin-bottom: 28px; }
.page-heading h1 { margin: 5px 0 8px; font-size: clamp(27px, 4vw, 40px); letter-spacing: -.04em; }
.page-heading p { margin: 0; color: var(--muted); line-height: 1.6; }
.section-title { margin: 36px 0 16px; font-size: 18px; }
.summary-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.summary-card { padding: 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.summary-card span { display: block; color: var(--muted); font-size: 12px; }
.summary-card strong { display: block; margin-top: 8px; font-size: 24px; font-variant-numeric: tabular-nums; }
.admin-create-panel { margin-top: 28px; padding: 22px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.admin-panel-heading h2 { margin: 0; font-size: 18px; }
.admin-panel-heading p { margin: 6px 0 0; color: var(--muted); font-size: 13px; }
.admin-create-form { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)) auto; gap: 12px; align-items: end; margin-top: 20px; }
.admin-create-form label { display: grid; gap: 7px; color: var(--ink); font-size: 12px; font-weight: 800; }
.admin-create-form input { width: 100%; min-height: 48px; padding: 0 13px; border: 1px solid var(--line); border-radius: 11px; color: var(--ink); background: white; }
.admin-create-form input:focus { border-color: var(--blue); box-shadow: 0 0 0 4px var(--blue-soft); outline: none; }
.admin-create-form .primary-button { min-width: 104px; }
.admin-form-message { margin-bottom: -4px; }
.admin-student-list, .admin-exam-list, .admin-exam-data-list { display: grid; gap: 11px; }
.admin-student-card { display: grid; grid-template-columns: minmax(180px,1fr) 72px 72px 132px auto 22px; gap: 18px; align-items: center; width: 100%; padding: 17px 18px; border: 1px solid var(--line); border-radius: 9px; color: var(--ink); background: white; text-align: left; transition: border-color .16s, background .16s; }
.admin-student-card:hover { border-color: #aeb8c7; background: #fafbfc; }
.admin-student-main, .admin-student-stat, .admin-student-date { display: block; min-width: 0; }
.admin-student-name { display: block; overflow: hidden; font-size: 15px; font-weight: 900; text-overflow: ellipsis; white-space: nowrap; }
.admin-student-login { display: block; overflow: hidden; margin-top: 5px; color: var(--muted); font-size: 12px; text-overflow: ellipsis; white-space: nowrap; }
.admin-student-stat small, .admin-student-date small, .admin-score-row small { display: block; margin-bottom: 5px; color: var(--muted); font-size: 10px; font-weight: 700; }
.admin-student-stat strong, .admin-student-date strong { display: block; font-size: 13px; font-variant-numeric: tabular-nums; }
.admin-row-arrow { color: var(--blue); font-size: 18px; }
.admin-exam-row { display: grid; grid-template-columns: minmax(220px, 1fr) 80px 80px auto; gap: 18px; align-items: center; padding: 17px 18px; border: 1px solid var(--line); border-radius: 9px; background: white; }
.admin-exam-card { padding: 21px; border: 1px solid var(--line); border-radius: 16px; background: white; }
.admin-exam-heading { display: flex; gap: 16px; align-items: start; justify-content: space-between; }
.admin-exam-heading h3 { margin: 0; font-size: 16px; }
.admin-exam-heading p { margin: 6px 0 0; color: var(--muted); font-size: 12px; }
.admin-score-row { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 10px; margin-top: 17px; padding: 14px 16px; border-radius: 12px; background: var(--canvas); }
.admin-score-row strong { font-size: 14px; font-variant-numeric: tabular-nums; }
.admin-analysis-summary { margin: 16px 0 0; color: var(--muted); font-size: 13px; line-height: 1.65; }
.admin-exam-card .weak-list { margin-top: 12px; }
.exam-list { display: grid; gap: 12px; }
.exam-card { display: grid; grid-template-columns: minmax(0,1fr) auto auto; gap: 22px; align-items: center; padding: 19px 20px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); transition: border-color .16s, background .16s; }
.exam-card:hover { border-color: #aeb8c7; background: #fafbfc; }
.exam-title { margin: 0 0 6px; font-size: 16px; }
.exam-meta { color: var(--muted); font-size: 12px; }
.status-pill, .badge { display: inline-flex; gap: 5px; align-items: center; width: max-content; padding: 6px 9px; border-radius: 999px; font-size: 11px; font-weight: 800; white-space: nowrap; }
.status-pill.pending { color: var(--amber); background: var(--amber-soft); }
.status-pill.done, .badge.verified { color: var(--mint); background: var(--mint-soft); }
.score-compact { min-width: 80px; text-align: right; font-variant-numeric: tabular-nums; }
.score-compact strong { font-size: 18px; }
.score-compact span { display: block; margin-top: 3px; color: var(--muted); font-size: 11px; }
.round-button { display: grid; width: 42px; height: 42px; place-items: center; border: 0; border-radius: 13px; color: white; background: var(--blue); font-size: 22px; font-weight: 500; }
.round-button.done { color: var(--blue); background: var(--blue-soft); font-size: 18px; }
.empty-card { padding: 40px 24px; border: 1px dashed #bdc8da; border-radius: 16px; color: var(--muted); background: white; text-align: center; }

.back-button { padding: 8px 0; border: 0; color: var(--blue); background: transparent; font-weight: 800; }
.entry-progress { position: sticky; top: 72px; z-index: 10; display: flex; gap: 18px; align-items: center; margin: 0 0 22px; padding: 14px 18px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255,255,255,.94); box-shadow: 0 8px 24px rgba(24,39,75,.05); backdrop-filter: blur(10px); }
.progress-track { flex: 1; height: 8px; overflow: hidden; border-radius: 999px; background: #e8ecf4; }
.progress-fill { width: 0; height: 100%; border-radius: inherit; background: var(--blue); transition: width .16s; }
.progress-label { min-width: 72px; font-size: 13px; font-weight: 800; font-variant-numeric: tabular-nums; }
.answer-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; }
.answer-card { padding: 17px; border: 1px solid var(--line); border-radius: 15px; background: white; }
.answer-card.answered { border-color: #b8c7ed; background: #fbfcff; }
.answer-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 13px; }
.answer-number { font-size: 16px; font-weight: 900; }
.answer-type { color: var(--muted); font-size: 11px; }
.choices { display: grid; grid-template-columns: repeat(5, 1fr); gap: 7px; }
.choice-button { min-height: 44px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); background: white; font-weight: 800; }
.choice-button:hover { border-color: var(--blue); }
.choice-button.selected { border-color: var(--blue); color: white; background: var(--blue); box-shadow: 0 5px 12px rgba(49,92,221,.18); }
.integer-input { width: 100%; padding: 0 13px; font-size: 17px; font-weight: 800; font-variant-numeric: tabular-nums; }
.submit-bar { position: sticky; bottom: 18px; z-index: 12; display: flex; gap: 20px; align-items: center; justify-content: space-between; margin-top: 24px; padding: 16px 18px; border: 1px solid #cfd8e9; border-radius: 16px; background: rgba(255,255,255,.96); box-shadow: 0 14px 36px rgba(24,39,75,.14); backdrop-filter: blur(12px); }
.submit-note strong, .submit-note span { display: block; }
.submit-note span { margin-top: 3px; color: var(--muted); font-size: 12px; }

.result-hero { display: grid; grid-template-columns: 160px minmax(0,1fr); gap: 28px; align-items: center; padding: 26px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); background: white; }
.score-ring { display: grid; width: 130px; height: 130px; place-items: center; border: 8px solid var(--blue-soft); border-top-color: var(--blue); border-radius: 50%; text-align: center; }
.score-ring strong { display: block; font-size: 42px; line-height: 1; font-variant-numeric: tabular-nums; }
.score-ring span { display: block; margin-top: 5px; color: var(--muted); font-size: 12px; }
.result-copy h1 { margin: 0 0 10px; font-size: clamp(25px,4vw,38px); letter-spacing: -.04em; }
.result-copy p { max-width: 60ch; margin: 0; color: var(--muted); line-height: 1.7; }
.metric-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
.metric-panel { padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: white; }
.metric-panel h2 { margin: 0 0 18px; font-size: 16px; }
.metric-row { display: grid; grid-template-columns: 90px minmax(0,1fr) 48px; gap: 12px; align-items: center; margin: 13px 0; font-size: 13px; }
.metric-row strong { text-align: right; font-variant-numeric: tabular-nums; }
.bar { height: 9px; overflow: hidden; border-radius: 999px; background: #e9edf4; }
.bar span { display: block; height: 100%; border-radius: inherit; background: var(--blue); }
.weak-list { display: flex; flex-wrap: wrap; gap: 8px; }
.weak-chip { padding: 9px 11px; border-radius: 10px; color: var(--amber); background: var(--amber-soft); font-size: 12px; font-weight: 800; }
.wrong-list, .recommendation-list { display: grid; gap: 10px; }
.wrong-card { display: grid; grid-template-columns: 48px minmax(0,1fr) auto; gap: 14px; align-items: start; padding: 17px; border: 1px solid var(--line); border-radius: 14px; background: white; }
.wrong-number { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 12px; color: var(--red); background: var(--red-soft); font-weight: 900; }
.wrong-main strong { font-size: 14px; }
.wrong-main p { margin: 7px 0 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
.answer-pair { color: var(--muted); font-size: 12px; text-align: right; }
.answer-pair b { display: block; margin-top: 4px; color: var(--ink); font-size: 14px; }
.recommendation-card { display: flex; gap: 16px; align-items: center; justify-content: space-between; padding: 17px 18px; border: 1px solid var(--line); border-radius: 14px; color: inherit; background: white; text-decoration: none; }
.recommendation-card:hover { border-color: #b8c7ed; }
.recommendation-card h3 { margin: 7px 0 5px; font-size: 15px; }
.recommendation-card p { margin: 0; color: var(--muted); font-size: 12px; }
.recommendation-arrow { color: var(--blue); font-size: 20px; }
.notice { padding: 17px; border-radius: 13px; color: var(--muted); background: #eef1f6; font-size: 13px; line-height: 1.6; }
.toast { position: fixed; right: 22px; bottom: 22px; z-index: 40; max-width: 360px; padding: 13px 16px; border-radius: 12px; color: white; background: var(--ink); box-shadow: var(--shadow); font-size: 13px; }

@media (max-width: 780px) {
  .login-shell { grid-template-columns: minmax(0,440px); }
  .answer-grid, .metric-grid { grid-template-columns: 1fr; }
  .admin-create-form { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .admin-create-form .primary-button { min-height: 48px; }
  .admin-student-card { grid-template-columns: minmax(160px,1fr) repeat(2,64px) auto 20px; }
  .admin-exam-row { grid-template-columns: minmax(180px, 1fr) 64px 64px auto; }
  .admin-student-date { display: none; }
  .result-hero { grid-template-columns: 1fr; text-align: center; }
  .score-ring { margin: auto; }
  .result-copy p { margin-inline: auto; }
}

@media (max-width: 560px) {
  .header-inner { min-height: 64px; padding: 0 16px; }
  .student-menu { gap: 4px; }
  .student-menu > span { max-width: 80px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .login-shell { align-items: start; padding: 18px 14px; }
  .login-card { padding: 26px 22px; }
  .login-card h1 { font-size: 26px; }
  .pipeline-note ol { grid-template-columns: repeat(2, 1fr); row-gap: 10px; }
  .app-shell { padding: 28px 16px 72px; }
  .page-heading { align-items: start; }
  .summary-strip { grid-template-columns: 1fr 1fr; }
  .summary-card:last-child { grid-column: 1 / -1; }
  .admin-create-panel { padding: 20px 16px; }
  .admin-create-form { grid-template-columns: 1fr; }
  .admin-student-card { grid-template-columns: minmax(0,1fr) auto; gap: 13px 10px; padding: 17px; }
  .admin-student-main { grid-column: 1; }
  .admin-student-card > .status-pill { grid-column: 2; grid-row: 1; }
  .admin-student-stat { padding-top: 12px; border-top: 1px solid var(--line); }
  .admin-student-card > .admin-student-stat:nth-of-type(2) { grid-column: 1; }
  .admin-student-card > .admin-student-stat:nth-of-type(3) { grid-column: 2; text-align: right; }
  .admin-row-arrow { display: none; }
  .admin-exam-row { grid-template-columns: minmax(0, 1fr) auto; gap: 13px 10px; }
  .admin-exam-row > .admin-student-main { grid-column: 1 / -1; }
  .admin-exam-row > .admin-student-stat { padding-top: 12px; border-top: 1px solid var(--line); }
  .admin-score-row { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .admin-score-row > div:last-child { grid-column: 1 / -1; }
  .exam-card { grid-template-columns: minmax(0,1fr) auto; gap: 14px; }
  .exam-card .status-pill { grid-column: 1; grid-row: 2; }
  .score-compact { grid-column: 2; grid-row: 1 / 3; align-self: center; }
  .round-button { grid-column: 2; grid-row: 1 / 3; }
  .entry-progress { top: 64px; margin-inline: -4px; }
  .submit-bar { bottom: 10px; gap: 10px; }
  .submit-note span { display: none; }
  .wrong-card { grid-template-columns: 42px minmax(0,1fr); }
  .answer-pair { grid-column: 2; text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}